Cisco 1830 AP behaving wierdly

I have 2 Cisco 1830 AP deployed. Both are having Cisco Mobility Express software loaded. Secondary AP is in CAPWAP mode and that's fine. The master AP is working fine for 1 to 2 days (solid green) and then it started blinking in green, amber/red mode. I can't ping the master AP management IP when this happens. A power off and power on of the master AP will fix the problem. Anyone have any idea?

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